Torsional Vibration Testing

We look at torsional vibrations over time, which can be useful for detecting resonance frequencies which might otherwise be difficult to isolate.

When a machine ramps up to speed and then reaches setpoint, we can sometimes see a brief ringing at the shaft's natural resonance frequency (coming up to setpoint is a bit like hitting the shaft with a hammer, while it's in place).

In this graph, we have captured a machine startup cycle, and have applied pre-processing to eliminate glitches in the shaft encoder (we can work with a variety of devices from shaft encoders to optical strips).

We look at torsional vibrations over time, which can be useful for detecting resonance frequencies which might otherwise be difficult to isolate.

When a machine ramps up to speed and then reaches setpoint, we can sometimes see a brief ringing at the shaft's natural resonance frequency (coming up to setpoint is a bit like hitting the shaft with a hammer, while it's in place).

Here we we see the resonances at a particular point during a machine's startup cycle.

Orders can be marked in red: the resonance energy is shown in white.

Here we are looking at the resonance energy over the duration of the startup ramp, looking for transient events.